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Cheap flights from Ottawa to Illinois from C$ 253

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 22/4. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
11 Apr — 18 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ottawa to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Ottawa to Illinois
Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 March 2026.

Thu 16/45:25 p.m.
YOW
-
STL
1 stop6h 46m
United Airlines
Wed 22/411:15 a.m.
STL
-
YOW
1 stop4h 52m
United Airlines
Deal found 8/3C$ 443
Wed 3/610:44 a.m.
YOW
-
STL
1 stop6h 02m
United Airlines
Sat 6/61:13 p.m.
STL
-
YOW
1 stop7h 22m
United Airlines
Deal found 8/3C$ 448
Thu 16/45:25 p.m.
YOW
-
STL
1 stop5h 27m
United Airlines
Tue 21/46:30 a.m.
STL
-
YOW
1 stop6h 29m
United Airlines
Deal found 10/3C$ 458
Tue 7/45:50 p.m.
YOW
-
STL
1 stop7h 07m
United Airlines
Tue 14/411:15 a.m.
STL
-
YOW
2 stops9h 50m
United Airlines
Deal found 9/3C$ 459
Tue 7/43:55 p.m.
YOW
-
ORD
1 stop9h 27m
Multiple Airlines
Thu 9/412:00 p.m.
ORD
-
YOW
1 stop11h 25m
Multiple Airlines
Deal found 8/3C$ 471
Tue 7/411:00 a.m.
YOW
-
ORD
2 stops14h 22m
Multiple Airlines
Tue 14/46:01 p.m.
ORD
-
YOW
1 stop22h 24m
Multiple Airlines
Deal found 9/3C$ 490
Sat 18/47:00 a.m.
YOW
-
ORD
1 stop15h 17m
Multiple Airlines
Wed 22/41:27 p.m.
ORD
-
YOW
1 stop26h 58m
Multiple Airlines
Deal found 7/3C$ 492
Mon 20/47:00 a.m.
YOW
-
ORD
1 stop27h 36m
Multiple Airlines
Fri 24/41:43 p.m.
ORD
-
YOW
1 stop9h 42m
Multiple Airlines
Deal found 7/3C$ 493
Fri 24/45:40 a.m.
YOW
-
MDW
1 stop10h 40m
Multiple Airlines
Mon 27/411:00 a.m.
MDW
-
YOW
1 stop12h 20m
Multiple Airlines
Deal found 11/3C$ 498
Fri 10/45:40 a.m.
YOW
-
MDW
1 stop10h 40m
Multiple Airlines
Sun 12/44:05 p.m.
MDW
-
YOW
1 stop7h 34m
Multiple Airlines
Deal found 11/3C$ 505
Thu 6/85:50 p.m.
YOW
-
STL
1 stop6h 55m
United Airlines
Thu 13/86:00 a.m.
STL
-
YOW
1 stop6h 59m
United Airlines
Deal found 8/3C$ 509
Mon 27/43:35 p.m.
YOW
-
MDW
2 stops22h 25m
Multiple Airlines
Thu 30/411:00 a.m.
MDW
-
YOW
1 stop12h 20m
Multiple Airlines
Deal found 11/3C$ 509

Find flight deals from Ottawa to Illinois

Keep the following information in mind while searching for Ottawa to Illinois flight deals. Data was last updated 12 March 2026.

Round-trip from

C$ 443

One-way from

C$ 253

Popular in

January

Cheapest in

February

Average price

C$ 582

Good round-trip deal

C$ 556 or less

Good one-way deal

C$ 305 or less
United Airlines
  • United Airlines
  • 16/4-22/4
  • 2 total stops
  • 11h 38m total
  • Ottawa to Illinois
Search Deals
22/4
  • 22/4
  • 1 total stop
  • 15h 17m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (C$ 161 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease (C$ 62 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Ottawa to Illinois.
Search Deals
Price to beat on a one-way flight from Ottawa to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 12 March 2026.
Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 17/4

5:25 p.m.-9:13 p.m.

1 stop4h 48m

Lambert-St Louis

Mon 20/4

9:10 a.m.-9:35 p.m.

1 stop11h 25m

C$ 443

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 16/4

5:25 p.m.-9:52 p.m.

1 stop5h 27m

Lambert-St Louis

Tue 21/4

6:30 a.m.-1:59 p.m.

1 stop6h 29m

C$ 458

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 7/4

5:50 p.m.-11:57 p.m.

1 stop7h 07m

Lambert-St Louis

Tue 14/4

11:15 a.m.-10:05 p.m.

2 stops9h 50m

C$ 459

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 3/6

5:20 p.m.-9:16 p.m.

1 stop4h 56m

Lambert-St Louis

Sat 6/6

1:13 p.m.-9:35 p.m.

1 stop7h 22m

C$ 468

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 6/8

6:25 a.m.-9:16 p.m.

1 stop15h 51m

Lambert-St Louis

Thu 13/8

6:00 a.m.-4:15 p.m.

2 stops9h 15m

C$ 509

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 19/6

6:25 a.m.-3:46 p.m.

1 stop10h 21m

Lambert-St Louis

Wed 24/6

5:41 p.m.-10:03 a.m.

2 stops15h 22m

C$ 509

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Mon 6/4

5:40 a.m.-3:20 p.m.

1 stop10h 40m

Chicago Midway

Mon 13/4

11:00 a.m.-12:39 a.m.

1 stop12h 39m

C$ 546

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 26/3

6:00 a.m.-11:51 p.m.

2 stops18h 51m

Lambert-St Louis

Sun 12/4

9:10 a.m.-5:07 p.m.

1 stop6h 57m

C$ 584

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sat 18/4

8:40 a.m.-12:10 p.m.

1 stop4h 30m

Chicago Midway

Wed 22/4

7:30 a.m.-5:29 p.m.

2 stops8h 59m

C$ 585

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 16/4

6:50 a.m.-10:15 a.m.

1 stop4h 25m

Chicago Midway

Thu 23/4

11:00 a.m.-5:04 p.m.

1 stop5h 04m

C$ 595

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/3

Showing 1-10 of 53 resultsSorted by cheapest first
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2
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6

Best time to book a flight from Ottawa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ottawa with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Illinois

What is the cheapest month to book a flight from Ottawa to Illinois?

Currently, February is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 178). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 314). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to IL?

Find hourly flight availability from Ottawa to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 March 2026.

When flying from Ottawa to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Ottawa to Illinois

Explore weekly flight availability from Ottawa to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 12 March 2026.

The most flights from YOW to USIL are scheduled on a Monday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 12 March 2026.
Read reviews from past customers who have flown Porter Airlines,United Airlines, andAir Canada from Ottawa to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
423 reviews
Check prices

Crew

8.6

Food

7.6

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Porter Airlines
8.0
Very good
423 reviews
Porter Airlines
8.0
Very good
423 reviews
Check prices

Crew

8.6

Food

7.6

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
United Airlines
7.4
Good
9,418 reviews
Porter Airlines
8.0
Very good
423 reviews
Check prices

Crew

8.6

Food

7.6

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Air Canada
7.1
Good
10,800 reviews
Porter Airlines
8.0
Very good
423 reviews
Check prices

Crew

8.6

Food

7.6

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ottawa to Illinois?

    Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to Illinois. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

  • How long is the flight from Ottawa to Illinois?

    United Airlines and Porter Airlines can get you from Ottawa to Illinois in just under 4h 25m. Your travel time can differ by up to 23m. There are 1048 km between Ottawa and Illinois. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Ottawa to Illinois?

    Most travellers choose Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Lambert-St Louis when deciding on the best route from Ottawa to Illinois.

  • What are the most reliable airlines from Ottawa to Illinois?

    Before booking your flight to Illinois from Ottawa, check out the most reliable airlines to get you to your destination on time: ANA (76%), Republic Airways (76%), Air Canada( 73%).

  • What are the cheapest flights from Ottawa to Illinois?

    Looking for the cheapest flight from Ottawa to Illinois? While on average our users pay C$ 1,201, our data indicates the cheapest price to be C$ 243. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 506.

  • Can I find deals for flights from Ottawa to Illinois that include hotel bookings?

    Yes. In addition to deals on Ottawa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Illinois.

  • Can I find deals for business class flights from Ottawa to Illinois?

    Yes. Cheapflights offers flight deals from Ottawa to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ottawa to Illinois?

    Currently, February is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 178). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 314). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ottawa to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Ottawa to Illinois

Discover the top 3 airlines that operate flights from Ottawa to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 12 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 315AverageC$ 469FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 455AverageC$ 607FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 483AverageC$ 625FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ottawa to Illinois?

Cheapflights makes it easy to find Ottawa to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Illinois?

Cheapflights helps you find that perfect flight to Illinois from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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